Question

Copper (II) oxide can be reduced to copper metal by heating it in a stream
of hydrogen gas. Dry copper (II) oxide was placed in a weighed tube and
the tube reweighed.

Hydrogen was passed through the tube for 15 seconds before the
escaping gas was lit. The tube was heated for a few minutes. The
apparatus was then allowed to cool with hydrogen still passing through.
The tube was re-weighed. The process was repeated until there was no
further change in mass. Calculate the mass of : 1.copper(II) oxide 2: copper produced 3. oxygen in the copper(ll) oxide l

Answer 1

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